clang-cl reported "error: comparison of integers of different signs: 'DWORD'
(aka 'unsigned long') and 'HRESULT' (aka 'long') [-Werror,-Wsign-compare]"

Change-Id: I568f03bd863ba63e30143483d9573042f3506de7
Reviewed-on: https://gerrit.libreoffice.org/42597Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins <ci@libreoffice.org>